<?php
/**
 * @package     Joomla.Plugin
 * @subpackage  System.remember
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Joomla! System Remember Me Plugin
 *
 * @package     Joomla.Plugin
 * @subpackage  System.remember
 * @since       1.5
 */
class plgSystemRemember extends JPlugin
{
	public function onAfterInitialise()
	{
		$app = JFactory::getApplication();

		// No remember me for admin
		if ($app->isAdmin())
		{
			return;
		}

		$user = JFactory::getUser();
		if ($user->get('guest'))
		{
			$hash = JApplication::getHash('JLOGIN_REMEMBER');

			if ($str = JRequest::getString($hash, '', 'cookie', JREQUEST_ALLOWRAW | JREQUEST_NOTRIM))
			{
				// Create the encryption key, apply extra hardening using the user agent string.
				// Since we're decoding, no UA validity check is required.
				$privateKey = JApplication::getHash(@$_SERVER['HTTP_USER_AGENT']);

				$key = new JCryptKey('simple', $privateKey, $privateKey);
				$crypt = new JCrypt(new JCryptCipherSimple, $key);
				$str = $crypt->decrypt($str);
				$cookieData = @unserialize($str);
				// Deserialized cookie could be any object structure, so make sure the
				// credentials are well structured and only have user and password.
				$credentials = array();
				$filter = JFilterInput::getInstance();
				$goodCookie = true;
				if (is_array($credentials))
				{
					if (isset($cookieData['username']) && is_string($cookieData['username']))
					{
						$credentials['username'] = $filter -> clean($cookieData['username'], 'username');
					}
					else
					{
						$goodCookie = false;
					}
					if (isset($cookieData['password']) && is_string($cookieData['password']))
					{
						$credentials['password'] = $filter -> clean($cookieData['password'], 'string');
					}
					else
					{
						$goodCookie = false;
					}
				}
				else
				{
					$goodCookie = false;
				}

				if (!$goodCookie || !$app->login($credentials, array('silent' => true)))
				{
					$config = JFactory::getConfig();
					$cookie_domain = $config->get('cookie_domain', '');
					$cookie_path = $config->get('cookie_path', '/');
					// Clear the remember me cookie
					setcookie(
						JApplication::getHash('JLOGIN_REMEMBER'), false, time() - 86400,
						$cookie_path, $cookie_domain
					);
				}
			}
		}
	}
}
